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Poljot 3017 Mainspring - errrm which one?


SKEXIS

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Hello!

So, this ought to be simple given that these chrono movements have a big 12.5mm barrel, with (I estimate) a 1.95 height, non-automatic mainspring in them.

Thing is that having ordered a GR5575, it looks to have a spring end diameter that’s much too large for the barrel arbour. Then I look at a curiously labelled bag I have in a drawer that says ‘3017 springs’ only to note that these all have a spring end diameter that’s the opposite,  I.e is too tight to fit the arbour into!

It would be great if anyone could tell me the right spring reference for these please; looks like I’ve gone from one extreme to the other at the moment! 

Thank you

Andy

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